Electroconvulsive therapy apparatus and method for automatic monitoring of patient seizures

• US 4,878,498 A
• Filed: 02/23/1989
• Issued: 11/07/1989
• Est. Priority Date: 10/14/1988
• Status: Expired due to Term

• Current Assignee: Somatics Incorporated
• Original Assignee: Somatics Incorporated
• Inventors: Abrams, Richard, Swartz, Conrad M.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): GETZOW, SCOTT M
• Application Number:
  US07/313,906
• Time in Patent Office: 257 Days
• Field of Search: 128/419 S, 128/791, 128/731, 128/732
• US Class Current: 607/45
• CPC Class Codes: A61N 1/38 for producing shock effects

Abstract

A method and systen in electroconvulsive therapy (ECT) to automatically monitor and display the occurrence and the duration of the seizure activity generated during the administration of electrically induced therapeutic seizures. The ECT device includes a special-purpose electroencephaloraph (EEG) system to detect a specific EEG parameter (e.g. integrated voltage) of the electrically induced EEG seizure. The detected integrated voltage is converted to digital data and compared to a threshold reference value previously obtained from the same patient. The operator is informed by an electronic alphanumeric elapsed time display or indications on a moving strip chart paper record, or oscilloscope CRT screen, when the parameter has crossed the predetermined threshold reference value and how long since the termination of the ECT the parameter has taken to reach the reference value.

Claims

1. A method in electroconvulsive therapy (ECT) to monitor the termination of an induced seizure in a patient, the method including the steps of:

employing an ECT device, removably securing a plurality of electrodes on the head of the patient and applying electricity through the electrodes in an electroconvulsive therapy session to induce seizure, and

detecting the electrical brain waves of the patient in an electroencephalographic (EEG) device by amplifying the brain waves detected by at least one electrode removably secured to the head of the patient;

establishing and storing in system memory a baseline reference of a brain wave parameter, detecting the patient brain waves to commence the monitoring of the termination of the seizure in the range of 1-30 seconds after ceasing the said application to induce seizure, automatically determining the termination of seizure as determined by the monitored brain wave parameter declining to the said established reference, and displaying said termination of seizure.

2. A method in electroconvulsive therapy as in claim 1 and displaying the lack of a seizure by failure to reach said reference within a selected time period.

3. A method in electroconvulsive therapy as in claim 1 wherein the parameter is integrated voltage over a selected time period in the range of 0.5-3 seconds.

4. A method in electroconvulsive therapy as in claim 3 wherein the selected period is about one second.

5. A method in electroconvulsive therapy as in claim 1 wherein two detecting EEG electrodes are applied to the head of the patient on opposite sides of the head.

6. A method in electroconvulsive therapy as in claim 1 including the step of establishing the reference prior to said ECT therapy by measuring said parameter during at least two selected time periods, during which said periods the parameter is within a selected percentage of one period compared to another period, and averaging said parameter over said periods.

7. A system for electroconvulsive therapy (ECT) to monitor the termination of an induced seizure in a patient, the system including:

an ECT device including a plurality of electrodes removably securable on the head of the patient and means for applying electricity through the electrodes in an electroconvulsive therapy session to induce seizure, and

an electroencephalograph (EEG) means to detect electrical brain waves of the patient including means to amplify the brain waves and connected thereto, at least one electrode adapted to be removably secured to the head of the patient;

system memory means to establish and store in system memory a baseline reference of a brain wave parameter, timer means to commence monitoring of brain waves for the termination of the seizure in the range of 1-30 seconds after ceasing the said application to induce seizure, measurement means for automatically measuring the termination of seizure as determined by the decline of the monitored brain wave parameter to the said established reference, and display means to display said termination of seizure.

8. A system for electroconvulsive therapy as in claim 7 wherein the ECT device, EEG means and the display means are in one electrically integrated system.

9. A system for electroconvulsive therapy as in claim 7 and means for determining and displaying the lack of a seizure by failure to reach said established reference within a selected time period.

10. A system in electroconvulsive therapy as in claim 11 wherein the selected period is about one second.

11. A system in electroconvulsive therapy as in claim 7 wherein the parameter is integrated voltage over a selected time period in the range of 0.5-3 seconds.

12. A system in electroconvulsive therapy as in claim 7 wherein the display means is an LED time display.